编写一个win32下的串口通信程序

以下是一个简单的win32下的串口通信程序示例：

#include <windows.h>
#include <stdio.h>

int main()
{
    HANDLE hSerial;
    DCB dcbSerialParams = {0};
    COMMTIMEOUTS timeouts = {0};
    DWORD dwBytesRead, dwBytesWritten;
    char data[] = "Hello World!";
    char readBuffer[1024] = {0};

    // 打开串口
    hSerial = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

    if (hSerial == INVALID_HANDLE_VALUE) {
        printf("Error: Failed to open serial port.\n");
        return 1;
    }

    // 配置串口参数
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams)) {
        printf("Error: Failed to get serial port settings.\n");
        CloseHandle(hSerial);
        return 1;
    }

    dcbSerialParams.BaudRate = CBR_9600;
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;

    if (!SetCommState(hSerial, &dcbSerialParams)) {
        printf("Error: Failed to set serial port settings.\n");
        CloseHandle(hSerial);
        return 1;
    }

    // 设置超时时间
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;

    if (!SetCommTimeouts(hSerial, &timeouts)) {
        printf("Error: Failed to set serial port timeouts.\n");
        CloseHandle(hSerial);
        return 1;
    }

    // 发送数据
    if (!WriteFile(hSerial, data, sizeof(data), &dwBytesWritten, NULL)) {
        printf("Error: Failed to write to serial port.\n");
        CloseHandle(hSerial);
        return 1;
    }

    // 读取数据
    if (!ReadFile(hSerial, readBuffer, sizeof(readBuffer), &dwBytesRead, NULL)) {
        printf("Error: Failed to read from serial port.\n");
        CloseHandle(hSerial);
        return 1;
    }

    printf("Received data: %s\n", readBuffer);

    // 关闭串口
    CloseHandle(hSerial);

    return 0;
}

以上代码仅供参考，实际使用时需要根据具体情况进行修改和完善。